Proper Installation Practices

8/13/2019 Proper Installation Practices

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Proper InstallationPractices

GRE

Pipes and Fittings

1



Training

It is imperative that all people involved in GRE installation should

have basic knowledge in handling and assembly of GRE pipes and

fittings.

CPI is offering short course training in handling and assembly ofGRE pipes and fittings.

Installation contractors, engineers, inspectors, consultants, end users

and any other organizations involved are encouraged to attend the

training we are offering.

2



Handling of Materials

• To insure long life and trouble free service from any GRE

materials, careful handling is required at all times.

• Oftentimes, the problems found after the installation of GRE

materials are due to mishandling, specifically impact damages.

• To avoid mishandling problems, the following are

recommended.

3



4

Handling of Materials

Avoid lifting pipes in bundles.

Do not drag or slide the pipes in any way they my result in

abrasion.

Avoid excessive bending stress when lifting the pipes bylifting at two locations or using spreader bars.

Protect GRE material from all types of impact, avoid bumping

the pipes from any structure.

Do not throw or drop GRE materials.

When downloading the pipes, ensure that wooden bearing

boards at least 3˝ wide are placed not more than 3 meters apart

under the pipes.



Field Jointing System

5



6

Shaving of the Cut End of the Pipe

a) Support and hold the pipe in position firmly

- Contaminated pipe surfaces should be cleaned prior toshaving the pipe ends

- When holding the pipe in a vice, use rubber padding to

protect from damage

b) Carefully insert the arbor into the pipe

- Fix the arbor to the inside of the pipe by turning The

central tensioning bolt clockwise

c) Adjust the shaver to the required spigot diameterd) Shave the taper spigot

- Maximum shaving depth / feed is 2 mm

- Repeat the shaving action until the required spigot diameter / spigot

nose thickness is achieved



Sand all bonding surfaces

- Thoroughly sand within 2 hours from assembly

- Use flapper wheel sanders with a small drilling machine(1700 - 2000 rpm) or emery cloth with a grit of 60

- Bonding surfaces must be dry and clean before sanding

- Sanded surfaces must have a dull, fresh finish, not a polished look

Dry fit

e) Measure back from the edge of the spigot the required

insertion depth plus 50 mm and scribe a line

During final assembly the spigot may slip approximately 5 mm furtherinto the bell, therefore the dry fitted assembly should be approximately 5

mm longer per joint



- Install the band clamps

- Dry the bonding surfaces

- Pre-heat or cool down the bonding surfaces- Re-sand

Applying the adhesive.

- Select the proper size adhesive kit

- Prepare the adhesive.

- Never use adhesive that has started to gel

- Apply a thin layer of adhesive

Curing of the Adhesive Joint

1. Apply the heating blanket.

2. Determine the curing time3. Activate the heating blanket.

- During the time of curing the functioning of the heating blanket should

be checked regularly; if a cold heating blanket is found remedy the

problem and start the complete curing cycle

- During curing the joint should not be moved, vibrated

Documents

Proper Installation Practices